Changes

In the time of the [[Great Crusade]], the world of Prospero appeared to be a lush, verdant paradise. Its landscape featured vast forests, wide open plains, crystal-clear rivers which flowed through its mountains, and the Prosperine oceans teemed with biological life.{{Fn|2d}} The surface of Prospero was almost entirely abandoned by civilization, however, dotted with the remains of a long-dead culture. Empty cities, made up of hundreds of skeletal frames of iron and stone, were overgrown with forests and vines, while and former palaces were overrun with wild beasts.{{Fn|2e}}

The [[psychneuein,]] an indigenous species on Prospero, was a threat to the early settlers of Prospero, but civilization still flourished and grew for a time. The [[Thousand Sons]] theorized that, thousands of years prior to the Great Crusade, a warp-event triggered an explosion of uncontrolled psychic potential within Prospero's population, which in turn drove the pscyheneuein [[psychneuein,]] an indigenous species on Prospero, into a feeding frenzy, that would ultimately destroying destroy almost all sentient life on Prospero. The only survivors fled to, and fortified, what was then-called “The Tizcan commune,” the last outpost of the planet's civilization, which would become its capital and sole city, [[Tizca]].